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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Unsatisfied performance obligations | $ 10,000.0 |
Contracts with customers | $ 220.6 | $ 363.0
Minimum |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Unsatisfied performance obligations, expected period of satisfaction | 5 years |
Maximum |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Unsatisfied performance obligations, expected period of satisfaction | 20 years |

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